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- #Raspberry pi web monitor serial serial
- #Raspberry pi web monitor serial software
- #Raspberry pi web monitor serial code
#Raspberry pi web monitor serial serial
When the Raspberry Pi boots up, all the bootup information is sent to the serial port. T0:23:respawn:/sbin/getty -L ttyAMA0 115200 vt100ĭisable it by adding a # character to the beginning. Edit the file and move to the end of the file. This file has the command to enable the login prompt and this needs to be disabled. There are two files that need to be edited To enable the serial port for your own use you need to disable login on the port. Needless to say you will need some other way to login to the Raspberry Pi, and we suggest doing this over the network using an SSH connection. Arduino), the serial port console login needs to be disabled. To be able to use the serial port to connect and talk to other devices (e.g. Whilst this is useful if you want to login using the serial port, it means you can't use the Serial Port in your programs. I then extended this with a JSON endpoint /door.By default the Raspberry Pi’s serial port is configured to be used for console input/output. Screenshots of the web page when the door is closed and open. To remedy this I includedĪ web server that allows the status of the device to be checked remotely (on Reason I won’t know unless I observe the status LED.
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Web ServerĪ failure mode of this whole arrangement is that if it stops working for some Only way to see it is via the serial console. The logging was mainly used during development. Polls a flag every 5 seconds in order to detect signals and shutdownĬleanly (mainly useful during development).Īcquiring access to the GPIO pins requires elevated privileges, so after that’sĭone the application drops privileges to a regular user.Īll logging is done via syslog to avoid the need to manage an application.Notes the notification time to prevent repeatedly sending the notification.Checks the global state every 5 seconds and sends a notification if theĭoor has been open for more than 5 minutes.Updates the global state when a change is detected and notes the time theĭoor was opened if the state transitions to open.Receives updates from the GPIO thread via a channel and detects door state.Monitors the door state and controls the status LED.
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Where there is a dedicated thread for each of: The Pi Zero in question is actually the one I used for myĮ-Paper conference badge in 2019. Still immature, although improving every month.
#Raspberry pi web monitor serial software
Software in Rust and after some investigation I concluded Rust on ESP32 is The ESP32 would be perfect except I prefer to write With the parts I had on hand this meant an Espressif ESP32 Making https requests means the monitor needs to be able to access the Without this requirement it would have beenĮnough to wire an LED directly to the reed switch that could be observed from For example, if we left in theĬar but forgot to close the door. Would be alerted even if we were away from home. It was important that the monitor be able to send notifications so that we The garage door monitor uses this web hook to post messages. I created aĬhannel called House and then created an incoming webhook locked
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#Raspberry pi web monitor serial code
All code and designsĪre published in a git repo. An LED on the deviceįlashes to indicate status around once every second. There’s also a JSON endpoint that I use to put theĭoor state in the status bar of my Awesome desktop. Monitor has a web server that allows the current state to be viewed (on If the door is left openįor more than 5 minutes a message is posted to a Mattermost channel. The garage door state is monitored via a reed switch. (In reality the reed switch and magnet are better aligned than they appear in the photo) Overview & Goals Rust, and then built a stripped down Linux image to run it. Parts on hand as much as possible, implemented the monitoring application in This turned out to be a super fun project. To combat this I builtĪ monitor that sends an alert via Mattermost when the door has been left openįor more than 5 minutes. I’ve accidentally left our garage door open a few times.